Maybe you're not supposed to find the bachelors or bachelorettes to be genuinely attractive? I mean, they're all little chibi sprite people.
I'll admit I don't have the game yet, so maybe I'm missing a lot of characterization, but the bachelors look goofy and entertaining. I like the bachelorette who does witchcraft or something, but what are the rest? Popular girl, shy artist, housewife-to-be, and outgoing nerd? They just seem boring. I'm a woman who's attracted to women, pumped by the idea of being able to gay marry in a game, and I'm still more interested in the dudes overall here.
I think your opinion may change when you get the game. I think the key is that all the bachelors are extremely immature, clearly just teenagers. If you're a teenager playing this game, that's great, but most people who have nostalgia for classic Harvest Moon are in their 30s now. I think of my character as an extension of me. That farm is MY farm. It's an immersive experience - until you realize that you're expected to date, romance, and marry a high school movie stereotype who literally complains about doing homework when you talk to them, or says "hold on, I need to beat this level" instead of having a conversation with you. They're just so... off-putting. I can't STAND teenagers. I couldn't even stand them when I WAS one. Now I have to DATE and MARRY one? One of those little idiots has to be the father of my children? *shudder* Or I can marry the mustache-wielding older guy obsessed with model planes who, after 2 years of friendship, still reminds me to wash my hands each and every day and panics about my mining excursions? I don't want his paranoia anywhere near my children. Or the arrogant blonde douche who looks like someone my mother would have been attracted to in the 80s? That's IT?
I can't even bring myself to make friends with the teenagers. They're TEENAGERS. I do not befriend teenagers, dammit.
Even more potentially upsetting is the possibility that they might NOT be teenagers. If they're fully-grown and as mature as they're going to get, that makes them even LESS attractive, if such a thing is possible.
Also, the only non-white character you can actually date is female. All the male ones are white, which I find really annoying, though I suppose that can at least be fixed with modding.
If this is my little fantasy farm world and my little fantasy farm life, I want to have a fantasy farm husband who doesn't make me gag. To ConcernedApe's credit, he did say in an interview that he plans to add more marriageable characters as a result of all the negative feedback about how repulsive they all are, so here's hoping he manages that soon. Or a modder finds a way to let us marry the already-married actually-interesting-and-attractive characters.